Method for producing structured particles

摘要

Method for producing structured particles specifically nanoparticles, toners for laser printers and photocopiers, particularly chemical toner with particular product properties. The method produces toners of improved performance. Method relates particularly to the selection and properties of the base materials and utilizing these properties to design the toner product properties that result in improved performance.

主权项

1. A method for producing a toner comprising at least four base materials: latex, wax, charge control agent (CCA), and colorant, comprising the steps of:
a. preparing stable dispersions of at least one of each base material wherein mean particle size of the base material is less than 1000 nm; b. mixing the dispersions of step ‘a’ together wherein the particle size distribution among the base material particles are in predetermined ratios; c. heating of the mixture of step ‘b’ for flocculation to a temperature up to the Tg of the base material latex; d. optionally heating the above mixture above the Tg of the base material latex to consolidate the particles and control the shape of the particles; and e. obtaining toner particles, wherein said predetermined ratios of the particle size distribution among the base material particles are: latex to colorant, wax and CCA particle size distribution ratios are 0.1 to 1; colorant to latex, wax and CCA particle size distribution ratios are 10 to 1, 0.2 to 1, 0.2 to 1 respectively; wax to latex, colorant and CCA particle size distribution ratios are 10 to 1, 5 to 1 and 10 to 1 respectively; CCA to latex, colorant and wax particle size distribution ratios are 10 to 1, 5 to 1 and 0.1 to 1 respectively.